Calculating Furnace Size?


The best way to calculate a furnace size is to ask a contractor. They are trained in things like this and can ensure your sizing is done properly. The scientific method used is called The manual J load calculation.
Q&A Related to "Calculating Furnace Size?"
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1 Additional Answer
There are many ways to calculate the right furnace size for your house, and it is important that you do so. The most accepted method is the Manual J Load calculation that factors in construction material, insulation levels, windows, and sizes of rooms among other things. The software to do this calculation is available for purchase. If you are replacing an existing furnace you can simply replace it with a model that has the same output BTU.
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